Java开发中常用的工具类库有哪些

Java开发过程中的常用工具类库

Apache Commons类库

Apache?Commons是一个非常有用的工具包，为解决各种实际的问题提供了通用现成的代码，不需要我们程序员再重复造轮子。关于这个类库的详细介绍可以访问官网介绍。下面表格列出了部分的工具包。我们平时开发过程中可以根据自己的需要挑选合适的工具包。

BCELByte Code Engineering Library – analyze, create, and manipulate Java class files6.3.12019/3/24BeanUtilsEasy-to-use wrappers around the Java reflection and introspection APIs.1.9.32016/9/26BSFBean Scripting Framework – interface to scripting languages, including JSR-2233.12010/6/24ChainChain of Responsibility pattern implemention.1.22008/6/2CLICommand Line arguments parser.1.42017/3/9CodecGeneral encoding/decoding algorithms (for example phonetic, base64, URL).1.122019/2/16CollectionsExtends or augments the Java Collections Framework.4.32019/2/5CompressDefines an API for working with tar, zip and bzip2 files.1.182018/8/16ConfigurationReading of configuration/preferences files in various formats.2.42018/10/29CryptoA cryptographic library optimized with AES-NI wrapping Openssl or JCE algorithm implementations.1.0.02016/7/22CSVComponent for reading and writing comma separated value files.1.62018/9/25DaemonAlternative invocation mechanism for unix-daemon-like java code.1.0.152013/4/3DBCPDatabase connection pooling services.2.6.02019/2/19DbUtilsJDBC helper library.1.72017/7/20DigesterXML-to-Java-object mapping utility.3.22011/12/13EmailLibrary for sending e-mail from Java.1.52017/8/1ExecAPI for dealing with external process execution and environment management in Java.1.32014/11/6FileUploadFile upload capability for your servlets and web applications.1.42019/1/16FunctorA functor is a function that can be manipulated as an object, or an object representing a single, generic function.12011-??-??GeometrySpace and coordinates.12018-??-??Imaging (previously called Sanselan)A pure-Java image library.0.97-incubator2009/2/20IOCollection of I/O utilities.2.62017/10/15JCIJava Compiler Interface1.12013/10/14JCSJava Caching System2.2,12018/8/23JellyXML based scripting and processing engine.1.0.12017/9/27JexlExpression language which extends the Expression Language of the JSTL.3.12017/4/14JXPathUtilities for manipulating Java Beans using the XPath syntax.1.32008/8/14LangProvides extra functionality for classes in java.lang.3.92019/4/15LoggingWrapper around a variety of logging API implementations.1.22014/7/11MathLightweight, self-contained mathematics and statistics components.3.52015/4/17NetCollection of network utilities and protocol implementations.3.62017/2/15NumbersNumber types (complex, quaternion, fraction) and utilities (arrays, combinatorics).12017-??-??OGNLAn Object-Graph Navigation Language42013-??-??PoolGeneric object pooling component.2.6.22019/4/11ProxyLibrary for creating dynamic proxies.12008/2/28RDFCommon implementation of RDF 1.1 that could be implemented by systems on the JVM.0.3.0-incubating2016/11/15RNGImplementations of random numbers generators.1.22018/12/12SCXMLAn implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.It is capable of executing a state machine defined using a SCXML document, and abstracts out the environment interfaces.0.92008/12/1StatisticsStatistics.0.1????-??-??TextApache Commons Text is a library focused on algorithms working on strings.1.62018/10/16ValidatorFramework to define validators and validation rules in an xml file.1.62017/2/21VFSVirtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system.2.32019/2/4WeaverProvides an easy way to enhance (weave) compiled bytecode.22018/9/7

除了上面表格中的工具包，Apache Common项目还包括以下几个工具包，其中的http-client是我们平时非常常用的。

Cactus: Cactus is a simple test framework for unit testing server-side java code (Servlets, EJBs, Tag Libs, Filters, …). The intent of Cactus is to lower the cost of writing tests for server-side code.

HiveMind: HiveMind is a services and configuration microkernel. HiveMind allows you to create your application using a service oriented architecture.

HttpClient 3.x: Framework for working with the client-side of the HTTP protocol.

Naming: The Naming subproject will contain common JNDI code along with various JNDI providers.

Guava类库

Guava工程包含了若干被Google的 Java项目广泛依赖 的核心库，例如：集合 [collections] 、缓存 [caching] 、原生类型支持 [primitives support] 、并发库 [concurrency libraries] 、通用注解 [common annotations] 、字符串处理 [string processing] 、I/O 等等。下面列出Guava工具包中的常用功能点，以便需要的时候查阅使用。

基本工具 [Basic utilities]

使用和避免null：null是模棱两可的，会引起令人困惑的错误，有些时候它让人很不舒服。很多Guava工具类用快速失败拒绝null值，而不是盲目地接受。

前置条件: 让方法中的条件检查更简单。

常见Object方法: 简化Object方法实现，如hashCode()和toString()。

排序: Guava强大的”流畅风格比较器”

Throwables：简化了异常和错误的传播与检查。

集合[Collections]

Guava对JDK集合的扩展，这是Guava最成熟和为人所知的部分

不可变集合: 用不变的集合进行防御性编程和性能提升。

新集合类型: multisets, multimaps, tables, bidirectional maps等。

强大的集合工具类: 提供java.util.Collections中没有的集合工具。

扩展工具类：让实现和扩展集合类变得更容易，比如创建Collection的装饰器，或实现迭代器。

缓存[Caches]

Guava Cache：本地缓存实现，支持多种缓存过期策略。

函数式风格[Functional idioms]

Guava的函数式支持可以显著简化代码，但请谨慎使用它。

并发[Concurrency]

强大而简单的抽象，让编写正确的并发代码更简单

ListenableFuture：完成后触发回调的Future

Service框架：抽象可开启和关闭的服务，帮助你维护服务的状态逻辑

字符串处理[Strings]

非常有用的字符串工具，包括分割、连接、填充等操作

原生类型[Primitives]

扩展 JDK 未提供的原生类型（如int、char）操作， 包括某些类型的无符号形式

区间[Ranges]

可比较类型的区间API，包括连续和离散类型

I/O

简化I/O尤其是I/O流和文件的操作，针对Java5和6版本

散列[Hash]

提供比Object.hashCode()更复杂的散列实现，并提供布鲁姆过滤器的实现

事件总线[EventBus]

发布-订阅模式的组件通信，但组件不需要显式地注册到其他组件中

数学运算[Math]

优化的、充分测试的数学工具类

反射[Reflection]

Guava 的 Java 反射机制工具类

Spring中的常用工具类

FileCopyUtils；

WebUtil；

以上就是Java开发中常用的工具类库有哪些的详细内容，更多请关注【创想鸟】其它相关文章！